Building a video editor on the web. Part 0.

You should be able to create and edit videos using just the web in the browser. It should be possible to provide a user-interface akin to Screenflow that lets you create an output video that combines multiple videos, images, and audio into one video that can be uploaded to services like YouTube.

This post is really just a statement of intent. I am going to start the long process of working out what is and isn't available on the platform and seeing how far we can get today.

During some of the thoughts on this project, I had a Carl Sagan moment - so instead of inventing the universe to create an apple pie, I need to at least create all the tools needed to build a video editor, especially if I want to record the process of doing it. The fact that this post exists is because I know I have some of the pieces in place and ready to go.

I don't think I am going to create one massively monolithic 'video editor', that can be a business for someone else, but I do plan on trying to work out all the pieces that are needed so that I can make it easy to create great videos on the web and hopefully show a lot of people what is possible on the web.

Below is my rough one-page project plan:

Use cases that I have:




Code for this video Demo

const init = () => {  
  let blobs;  
  let rec;  
  let stream;  
  captureBtn.onclick = async () => {  
    stream = await navigator.mediaDevices.getUserMedia({video: { width: 1280, 
height: 720 }, audio: true});

    videoElement.srcObject = stream;  
    let opts = {mimeType: 'video/webm; codecs=vp9,opus'};  
    blobs = []; = 'none'

    rec = new MediaRecorder(stream, opts);  
    rec.ondataavailable = (e) => blobs.push(;  
    rec.onstop = async () => {  
      let blob = new Blob(blobs, {type: 'video/webm'});  
      let url = window.URL.createObjectURL(blob);  
      download.href = url; = 'test.webm'; = 'block';  
    startBtn.disabled = false;  
    captureBtn.disabled = true;  

  startBtn.onclick = () => {  
    startBtn.disabled = true;  
    stopBtn.disabled = false;  

  stopBtn.onclick = () => {  
    captureBtn.disabled = false;  
    startBtn.disabled = true;  
    stopBtn.disabled = true;

    videoElement.srcObject = null  
    stream = null;  

window.addEventListener('load', init);  

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